New model of Gibbs free energy difference for bulk metallic glasses

Abstract A newly derived expression for estimation of Gibbs free energy difference (Δ G ) between the crystalline and under-cooled liquid of glass-forming alloys have been utilized to obtain theoretical Δ G for a variety of alloy systems. It gives better results nearly overlapping with the experimental values over entire under-cooling region for all alloy systems studied in this paper. However, the theoretical results given by other expressions deviate from the experimental values even in small under-cooling region except that the expressions proposed by Thompson and Spaepen and Lad et al. give a close estimation to the experimental Δ G in the temperature region of 680–937 K for Zr 41.2 Ti 13.8 Ni 10 Cu 12.5 Be 22.5 and 450–662 K for La 55 Cu 10 Ni 10 Al 25 , respectively. In addition, the results in present work will provide us with the evidence of the choice of the α values for different metallic glasses.